Fracture and mechanical characteristics of CO2-saturated sandstone at extreme loading conditions

Xing, H.Z.; Wu, G.; Dehkhoda, Sevda; Ranjith, P.G.; Zhang, Qianbing

doi:10.1016/j.ijrmms.2019.03.025

Cited by 22 publications

(4 citation statements)

References 36 publications

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“…23 Xing studied the evolution of the strain field of CO 2 -saturated sandstone under compression at a high strain rate. 24 Shang studied the dynamic process of liquid CO 2 fracturing by analyzing surface strain data. 25 Cai concluded through strain monitoring that smaller strain could be obtained when fracturing vent holes are distributed in the direction perpendicular to the rock bedding plane.…”

Section: Introductionmentioning

confidence: 99%

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Strain Field Characteristics of Coal-like Material under CO₂ Fracturing

Wang,

Pan,

Fujii

2023

ACS Omega

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Considering the problems related to hydrofracturing, CO2 fracturing is a more effective way to enhance the permeability of coal seams. Conventional research has focused on the dynamic behavior of coal and rock under CO2 fracturing. There is a lack of quantitative descriptions of the fracturing stages. Therefore, CO2 fracturing experiments were carried out with coal-like material at several pressures. The maximum principal strain field was obtained by analyzing the surface images of the specimens. Nine characteristic parameters of typical grayscale and texture images were calculated from the strain field. The correlation between the maximum principal strain and the characteristic parameters was examined using gray relational analysis, and the effects of pressure on those parameters were investigated. We obtained some interesting results, for example, the standard deviation increased from 50 to 100, and kurtosis decreased from −1.0 to −1.5 with the fracturing pressure. The thresholds of the characteristic function F at different fracturing stages were determined, too. This research provides a basis for designing the drilling hole location and determining the millisecond delay of multihole fracturing, as well as for automatically dividing the fracturing stages with artificial intelligence based on the maximum principal strain field.

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Section: Introductionmentioning

confidence: 99%

“…The change in coal microstructure was obtained through image calculations . Xing studied the evolution of the strain field of CO 2 -saturated sandstone under compression at a high strain rate . Shang studied the dynamic process of liquid CO 2 fracturing by analyzing surface strain data .…”

Section: Introductionmentioning

confidence: 99%

Strain Field Characteristics of Coal-like Material under CO₂ Fracturing

Wang,

Pan,

Fujii

2023

ACS Omega

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“…5 Carbon capture, utilization, and storage (CCUS) has been considered as one of the most promising ways to stabilize the atmospheric CO 2 concentration and mitigate climate change. 6 For example, CO 2 can be sequestrated in deep saline sandstone aquifers 7,8 or deep-sea sediments. 9 In addition, it can be used to enhance coalbed methane, 10−12 shale gas 13,14 and oil recovery, 15,16 improve heat extraction from an enhanced geothermal system, 17 and facilitate rock fracturing.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon capture, utilization, and storage (CCUS) has been considered as one of the most promising ways to stabilize the atmospheric CO 2 concentration and mitigate climate change . For example, CO 2 can be sequestrated in deep saline sandstone aquifers , or deep-sea sediments . In addition, it can be used to enhance coalbed methane, − shale gas , and oil recovery, , improve heat extraction from an enhanced geothermal system, and facilitate rock fracturing. − Large-scale storage of CO 2 in deep formations, which involves thermo–hydro–mechanical–chemical processes, may damage the microstructure of the rock formation, causing considerable fluid pressure perturbation, altering the in situ stresses, and then increasing the leak-off risk. , The damage induced by CO 2 storage to sandstone can be attributed to physical and chemical factors.…”

Section: Introductionmentioning

confidence: 99%

Microscale Damage Induced by CO₂ Storage on the Microstructure of Sandstone Coupling Hydro–Mechanical–Chemical Processes

Nie

Zhang

et al. 2022

Energy Fuels

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A good understanding of CO2–brine–rock interactions that cause microscale damage to the microstructure of sandstone, affecting pore fluid transport and reservoir stability, is important for studying storage efficiency during CO2 storage. In this study, the equipment is first designed to saturate rock samples using CO2–brine under in situ conditions and then the homogeneous and heterogeneous sandstone samples are saturated for 30 days with and without the confining pressure (20 MPa). Through scanning electron microscopy (SEM) observation and analysis, it is found that the confining pressure reduces the degree of damage in various scales from micrometer to millimeter, such as reducing the mineral dissolution, decreasing the induced swelling of the bedding planes, and causing some pores to collapse. The nuclear magnetic resonance results show that the change in porosity is mainly caused by the increase in the number of relatively small-sized (characterized in terms of fluid relaxation time T 2 < 10–3 s) pores after CO2–brine saturation. In addition, the alterations of the pore system in homogeneous and heterogeneous sandstones are different, such as a larger increase in the porosity of homogeneous sandstone (by 5.29%). In heterogeneous sandstone, the effect of mineral dissolution induced by chemical reactions on damaging the microstructure is more obvious than mineral swelling. In addition, it is found that the CO2–brine saturation decreases the fractal dimension of the sandstone by nearly 2%, increasing the pore connectivity. This study is helpful for understanding the evolution of the sandstone microstructure under geological conditions during the long-term CO2 storage process.

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Experimental Study on the Mechanical Properties of Shale After Long-term of Immersion in Fracturing Fluids with Different pH

Lyu

Wang

et al. 2022

Rock Mech Rock Eng

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Fracture and mechanical characteristics of CO2-saturated sandstone at extreme loading conditions

Cited by 22 publications

References 36 publications

Strain Field Characteristics of Coal-like Material under CO₂ Fracturing

Strain Field Characteristics of Coal-like Material under CO₂ Fracturing

Microscale Damage Induced by CO₂ Storage on the Microstructure of Sandstone Coupling Hydro–Mechanical–Chemical Processes

Experimental Study on the Mechanical Properties of Shale After Long-term of Immersion in Fracturing Fluids with Different pH

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Fracture and mechanical characteristics of CO2-saturated sandstone at extreme loading conditions

Cited by 22 publications

References 36 publications

Strain Field Characteristics of Coal-like Material under CO2 Fracturing

Strain Field Characteristics of Coal-like Material under CO2 Fracturing

Microscale Damage Induced by CO2 Storage on the Microstructure of Sandstone Coupling Hydro–Mechanical–Chemical Processes

Experimental Study on the Mechanical Properties of Shale After Long-term of Immersion in Fracturing Fluids with Different pH

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Strain Field Characteristics of Coal-like Material under CO₂ Fracturing

Strain Field Characteristics of Coal-like Material under CO₂ Fracturing

Microscale Damage Induced by CO₂ Storage on the Microstructure of Sandstone Coupling Hydro–Mechanical–Chemical Processes